Adjustable rake extension



FIG. 1 is a perspective view of an adjustable rake extension showing my new design with the broken line showing of a rake being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevatational view thereof;

FIG. 5 is an opposite side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for an adjustable rake extension, as shown and described. 